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The SD20 is a normally aspirated 2.0 L (1,991 cc) straight-fourdiesel engine with a bore and stroke of 83.0 and 92.0 mm. It had three main bearings. The Diesel versions of the Nissan Cedric in the 1960s until the early 1980s used this engine, which produces 60 PS (44 kW) at 4,000 rpm.[1] It was first seen in June 1964, when it was fitted to the QGS31 Nissan Cedric.

The SD22 is a normally aspirated 2.2 L (2,164 cc) inline-four diesel engine. It is a stroked version of the smaller SD20 (83.0 x 100.0 mm bore and stroke). It produces 65 PS (48 kW) at 4,000 rpm as fitted to the 1983 430-series Nissan Cedric.[1] It was first used in the 330-series Nissan Cedric from June 1977. It was also produced in a marine version MN 22 by Chrysler Marine under license during the 1980s.

The SD22 was used in the Datsun 720 pickup trucks from 1980 through 1983, where it produced 61 hp (45 kW) (SAE) at 4,000 rpm. Like its lesser SD20 relative (but unlike its SD33 six-cylinder derivative) it has three main bearings and was never available with turbocharging. In 1981, pistons were upgraded to a three ring piston with a steel compression ring carrier cast as part of the piston for improved durability.

The engine is popular in Australia utilized mostly as a reliable pump for remote livestock stations. The engine may still by manufactured and imported by JESCO in California. JESCO also supplies parts. The marine version, using a water-cooled exhaust manifold and expansion tank is also still available from other manufacturers.

The SD23 is a 2.3 L (2,289 cc) straight four diesel engine with eight valves (two per cylinder), and a distributor type injection pump. It is a bored out version of the SD20, with a bore and stroke of 89.0 x 92.0&nnsp;mm. It produces 74 PS (54 kW; 73 hp) SAE net at 4,300 rpm and was fitted to the Nissan 720 and D21 Pickups, as well as the E23 Nissan Urvan and export market Y30-series Cedrics.[2] The engine has also been used in many other functions, for forklifts, marine, and stationary applications. Unlike the smaller engines, the SD23 received a five bearing crankshaft. The European-spec version claimed 50 kW (68 PS), as fitted to the 1985 Urvan.[3]

The 2.5 L (2,488 cc) SD25 is the biggest version of the four-cylinder SD series, with the larger bore and stroke of 89.0 and 100.0 mm. It was fitted to Nissan 720 pickup trucks 1983 through 1986 and D21 Nissan pickups (only 1987 in Canada). It was also fitted to the Nissan Urvan and Cabstar. Featured five main bearing crankshaft & redesigned rear main seal.

The SD33 is a 3.2 L (3,245 cc or 198.0 cu in) straight-sixdiesel engine, most known for its use in the Nissan Patrol MQ (160 series) from 1980-1983[4] and the Nissan C80. The SD33 produces 82 PS (60 kW) at 3,800 rpm.

The Engine was also used in the UD 3400 series light truck, large forklifts, Marine applications, in International Scout offerings from 1976 to 1979, as well as the Jeep CJ-10/Cj-10A flightline tow vehicles from 1985 to 1986. The Scout-based Monteverdi Sahara was also offered with the SD33.[5]

From July 1983 until 1987, SD33T engines were fitted to the Nissan Patrol MK (160 series - model 2). The SD33T produces 107 PS (105 hp/78 kW) and 175 lb/ft (237 nm) of torque and is considered to be a fuel efficient and reliable diesel engine.